Yes, the sun will still create specular highlights. The surface of the water will break up the highlight a bit, so the highlights won't get as tight and small, but they are definitely there. I cheated the size a little bit, but here's some reference:http://www.infinitylist.com/wordpress2/wp-content/uploads/2013/06/GoPro-DeepFlight-Submersible.jpghttp://guidetocaribbeanvacations.com/bermuda/images/Helmet%20Diving.jpg